Door-operating mechanism.



F D. WARD.

DOOR OPERATING MECHANISM.

APPLICATION man FEB. 20. 1917.

iififiv o Patented Nov, 20, 1917.

FRANK D. WARD, OF NEW YORK, N. Y.

DOOR-OPERATING MECHANISM.

Application filed February 20, 1917.

To all whom it may concern:

Be it known that I, FRANK D. WARD, a citizen of the United States, and a resident of the borough of Manhattan, city and State of New York, have invented certain new and useful Improvements in Door-Operating Mechanism, of which the following is a description in such full, clear, and exact terms as will enable any person skilled in the art to which it pertains to make and use the same.

My invention relates to a mechanism for operating the sliding doors of street railway cars or indeed sliding doors in other situations.

In modern street railway practice it is the fashion to mount the doors so that they slide in their own plane to opened or closed position. This is especially true of what are termed the pay-as-you-enter cars.

The object of my invention is to provide a linkage which will allow the air, electric or other motor device to actuate these doors quickly and easily and with a minimum eX- penditure of power from friction, leverage or other conditions.

To these ends I have devised the devices shown in the accompanying drawings which represent the preferred embodiment of my invention and in which drawings- Figure 1 is a plan view of the mechanism with the door in open position, and

Fig. 2 is a plan view with the door in closed position.

At the outset it must be understood that this door operating mechanism is arranged either at the top of the door in the roof of the car or at the bottom of the door in the floor of the car (or other structure) so that it does not interfere with the free movement of persons through the doorway.

10 indicates the wall of the car or other structure in connection with which my invention is used, and 11 indicates the door. 12 indicates the guide or slideway in which the door 11 moves.

14 indicates the thrust rod which operates the door mechanism and which itself is operated from any proper or desired source, either manually or from a suitable motor Specification of Letters Patent.

Patented Nov. 20, 191W.

Serial No. 149,843.

door 11 and 21 and 22 are cross links which are pivoted to the arms 15 and 18 at equidistant points along the arms. Hence when the thrust rod 14 operates in one direction or the other according to the double arrow shown in the drawings, the arm 15 has a swinging motion around the pivot 16 and this brings about a difierential motion of the links 21 and 22 which gives the arm 18 a greatly multiplied movement at its end which is connected to the sliding door 11. It is by this movement that said door is operated as described. Not only is the movement of the swinging end of the arm 18 increased in extent but it is greatly accelerated in time and therefore the door opening mechanism operates the door very quickly both to open and close the same upon the back and forward motion of the thrust rod 14 or such other device that may be employed to impart the primary motion to the arm 15.

What I claim is 1. The combination of two swinging arms, one pivoted to a fixed support and the other pivoted to the part to be operated, a cross link connection between said arms and means for imparting swinging motion to the first arm.

2. The combination with a casement and the part to be operated, of a swinging arm pivoted to the casement, a swinging arm pivoted to said part, two links extending across each other and having their ends pivoted respectively to said arms for the purpose specified.

In testimony whereof I have hereunto signed my name in the presence of two witnesses.

FRANK D. WARD.

Witnesses:

C. G. TreHn, W. A. COGKLEY.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

